HC Deb 23 November 1911 vol 31 cc1441-4
    cc1441-2
  1. CLAUSE 29.—(Standard of Ventilation.) 530 words
    2. c1443
  2. CLAUSE 30.—(Classification of Mines for purposes of Ventilation.) 140 words
    3. cc1443-4
  3. CLAUSE 31.—(Requirements as to the use of certain Methods of Ventilation.) 495 words